I was able to get it working with :

1) add manually following lines to xorg.conf
        DefaultDepth    24
        SubSection "Display"
                Modes   "1920x1200" "1280x800"
                Virtual 3200 1200
        EndSubSection
2) restart X (logout and login again)
3) start gnome-display-properties
4) gnome-display-properties now displays only one monitor
5) to get both monitor visible, I checked Mirror screen checmark (press Apply 
after that) and then uncheck again Mirror screen with another press of Apply.
6) Now I can see both of my monitors and configure them normally in 
gnome-display-properties dialog

With smaller external monitor or without external monitor, all these
manual steps are not needed and gnome-display-properties application
adds required lines (Virtual display definition) to xorg.conf
automatically.

-- 
gnome-display-properties quits with segmentation fault
https://bugs.launchpad.net/bugs/324485
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